Most practical martial art?

Wushu actually isn't bad at all in terms of physical conditioning. The people I know who practice it are pretty cut. It also gives a really good sense of balance. In a fighting situation however, I don't think you'd want to try using it at all. Same pretty much goes for TKD.

I'd say kickboxing is a good one. I'd throw in kickboxing because even if they guy has a granite chin, a few hard leg kicks can make him go down... unless he's been training or something.

I find boxing a little limited in terms of range, but it's conditioning aspect is the best of all martial arts in my opinion.

Muay thai is really effective, but I don't know if bone strengthening techniques have improved. I hear people who train seriously in MT can't walk after 40 because of really weak bones. If you can get past that, the elbows and knees are lethal.

I like the Genki Sudo style... which is like breakdancing/popping and throwing spinning backfists, then somehow getting a flying triangle.

Jam it back in, in the dark.